Commit | Line | Data |
---|---|---|
b97bf3fd PL |
1 | /* |
2 | * net/tipc/node.c: TIPC node management routines | |
c4307285 | 3 | * |
16e166b8 | 4 | * Copyright (c) 2000-2006, 2012-2014, Ericsson AB |
46651c59 | 5 | * Copyright (c) 2005-2006, 2010-2014, Wind River Systems |
b97bf3fd PL |
6 | * All rights reserved. |
7 | * | |
9ea1fd3c | 8 | * Redistribution and use in source and binary forms, with or without |
b97bf3fd PL |
9 | * modification, are permitted provided that the following conditions are met: |
10 | * | |
9ea1fd3c PL |
11 | * 1. Redistributions of source code must retain the above copyright |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3. Neither the names of the copyright holders nor the names of its | |
17 | * contributors may be used to endorse or promote products derived from | |
18 | * this software without specific prior written permission. | |
b97bf3fd | 19 | * |
9ea1fd3c PL |
20 | * Alternatively, this software may be distributed under the terms of the |
21 | * GNU General Public License ("GPL") version 2 as published by the Free | |
22 | * Software Foundation. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
25 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
28 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
32 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
33 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
b97bf3fd PL |
34 | * POSSIBILITY OF SUCH DAMAGE. |
35 | */ | |
36 | ||
37 | #include "core.h" | |
22ae7cff | 38 | #include "link.h" |
b97bf3fd | 39 | #include "node.h" |
b97bf3fd | 40 | #include "name_distr.h" |
50100a5e | 41 | #include "socket.h" |
b97bf3fd | 42 | |
6c00055a DM |
43 | static void node_lost_contact(struct tipc_node *n_ptr); |
44 | static void node_established_contact(struct tipc_node *n_ptr); | |
8a0f6ebe | 45 | static void tipc_node_delete(struct tipc_node *node); |
b97bf3fd | 46 | |
02be61a9 JPM |
47 | struct tipc_sock_conn { |
48 | u32 port; | |
49 | u32 peer_port; | |
50 | u32 peer_node; | |
51 | struct list_head list; | |
52 | }; | |
53 | ||
3e4b6ab5 RA |
54 | static const struct nla_policy tipc_nl_node_policy[TIPC_NLA_NODE_MAX + 1] = { |
55 | [TIPC_NLA_NODE_UNSPEC] = { .type = NLA_UNSPEC }, | |
56 | [TIPC_NLA_NODE_ADDR] = { .type = NLA_U32 }, | |
57 | [TIPC_NLA_NODE_UP] = { .type = NLA_FLAG } | |
58 | }; | |
59 | ||
a635b46b AS |
60 | /* |
61 | * A trivial power-of-two bitmask technique is used for speed, since this | |
62 | * operation is done for every incoming TIPC packet. The number of hash table | |
63 | * entries has been chosen so that no hash chain exceeds 8 nodes and will | |
64 | * usually be much smaller (typically only a single node). | |
65 | */ | |
872f24db | 66 | static unsigned int tipc_hashfn(u32 addr) |
a635b46b AS |
67 | { |
68 | return addr & (NODE_HTABLE_SIZE - 1); | |
69 | } | |
70 | ||
8a0f6ebe YX |
71 | static void tipc_node_kref_release(struct kref *kref) |
72 | { | |
73 | struct tipc_node *node = container_of(kref, struct tipc_node, kref); | |
74 | ||
75 | tipc_node_delete(node); | |
76 | } | |
77 | ||
78 | void tipc_node_put(struct tipc_node *node) | |
79 | { | |
80 | kref_put(&node->kref, tipc_node_kref_release); | |
81 | } | |
82 | ||
83 | static void tipc_node_get(struct tipc_node *node) | |
84 | { | |
85 | kref_get(&node->kref); | |
86 | } | |
87 | ||
1ec2bb08 | 88 | /* |
672d99e1 AS |
89 | * tipc_node_find - locate specified node object, if it exists |
90 | */ | |
f2f9800d | 91 | struct tipc_node *tipc_node_find(struct net *net, u32 addr) |
672d99e1 | 92 | { |
f2f9800d | 93 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
672d99e1 | 94 | struct tipc_node *node; |
672d99e1 | 95 | |
34747539 | 96 | if (unlikely(!in_own_cluster_exact(net, addr))) |
672d99e1 AS |
97 | return NULL; |
98 | ||
6c7a762e | 99 | rcu_read_lock(); |
f2f9800d YX |
100 | hlist_for_each_entry_rcu(node, &tn->node_htable[tipc_hashfn(addr)], |
101 | hash) { | |
46651c59 | 102 | if (node->addr == addr) { |
8a0f6ebe | 103 | tipc_node_get(node); |
6c7a762e | 104 | rcu_read_unlock(); |
672d99e1 | 105 | return node; |
46651c59 | 106 | } |
672d99e1 | 107 | } |
6c7a762e | 108 | rcu_read_unlock(); |
672d99e1 AS |
109 | return NULL; |
110 | } | |
111 | ||
f2f9800d | 112 | struct tipc_node *tipc_node_create(struct net *net, u32 addr) |
b97bf3fd | 113 | { |
f2f9800d | 114 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
672d99e1 | 115 | struct tipc_node *n_ptr, *temp_node; |
b97bf3fd | 116 | |
f2f9800d | 117 | spin_lock_bh(&tn->node_list_lock); |
b45db71b JPM |
118 | n_ptr = tipc_node_find(net, addr); |
119 | if (n_ptr) | |
120 | goto exit; | |
5af54792 | 121 | n_ptr = kzalloc(sizeof(*n_ptr), GFP_ATOMIC); |
a10bd924 | 122 | if (!n_ptr) { |
2cf8aa19 | 123 | pr_warn("Node creation failed, no memory\n"); |
b45db71b | 124 | goto exit; |
a10bd924 | 125 | } |
a10bd924 | 126 | n_ptr->addr = addr; |
f2f9800d | 127 | n_ptr->net = net; |
8a0f6ebe | 128 | kref_init(&n_ptr->kref); |
51a8e4de | 129 | spin_lock_init(&n_ptr->lock); |
672d99e1 AS |
130 | INIT_HLIST_NODE(&n_ptr->hash); |
131 | INIT_LIST_HEAD(&n_ptr->list); | |
a8f48af5 | 132 | INIT_LIST_HEAD(&n_ptr->publ_list); |
02be61a9 | 133 | INIT_LIST_HEAD(&n_ptr->conn_sks); |
05dcc5aa | 134 | __skb_queue_head_init(&n_ptr->bclink.deferdq); |
f2f9800d | 135 | hlist_add_head_rcu(&n_ptr->hash, &tn->node_htable[tipc_hashfn(addr)]); |
f2f9800d | 136 | list_for_each_entry_rcu(temp_node, &tn->node_list, list) { |
672d99e1 AS |
137 | if (n_ptr->addr < temp_node->addr) |
138 | break; | |
139 | } | |
6c7a762e | 140 | list_add_tail_rcu(&n_ptr->list, &temp_node->list); |
aecb9bb8 | 141 | n_ptr->action_flags = TIPC_WAIT_PEER_LINKS_DOWN; |
fc0eea69 | 142 | n_ptr->signature = INVALID_NODE_SIG; |
8a0f6ebe | 143 | tipc_node_get(n_ptr); |
b45db71b | 144 | exit: |
f2f9800d | 145 | spin_unlock_bh(&tn->node_list_lock); |
b97bf3fd PL |
146 | return n_ptr; |
147 | } | |
148 | ||
8a0f6ebe | 149 | static void tipc_node_delete(struct tipc_node *node) |
b97bf3fd | 150 | { |
8a0f6ebe YX |
151 | list_del_rcu(&node->list); |
152 | hlist_del_rcu(&node->hash); | |
153 | kfree_rcu(node, rcu); | |
b97bf3fd PL |
154 | } |
155 | ||
f2f9800d | 156 | void tipc_node_stop(struct net *net) |
46651c59 | 157 | { |
f2f9800d | 158 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
46651c59 YX |
159 | struct tipc_node *node, *t_node; |
160 | ||
f2f9800d YX |
161 | spin_lock_bh(&tn->node_list_lock); |
162 | list_for_each_entry_safe(node, t_node, &tn->node_list, list) | |
8a0f6ebe | 163 | tipc_node_put(node); |
f2f9800d | 164 | spin_unlock_bh(&tn->node_list_lock); |
46651c59 YX |
165 | } |
166 | ||
f2f9800d | 167 | int tipc_node_add_conn(struct net *net, u32 dnode, u32 port, u32 peer_port) |
02be61a9 JPM |
168 | { |
169 | struct tipc_node *node; | |
170 | struct tipc_sock_conn *conn; | |
8a0f6ebe | 171 | int err = 0; |
02be61a9 | 172 | |
34747539 | 173 | if (in_own_node(net, dnode)) |
02be61a9 JPM |
174 | return 0; |
175 | ||
f2f9800d | 176 | node = tipc_node_find(net, dnode); |
02be61a9 JPM |
177 | if (!node) { |
178 | pr_warn("Connecting sock to node 0x%x failed\n", dnode); | |
179 | return -EHOSTUNREACH; | |
180 | } | |
181 | conn = kmalloc(sizeof(*conn), GFP_ATOMIC); | |
8a0f6ebe YX |
182 | if (!conn) { |
183 | err = -EHOSTUNREACH; | |
184 | goto exit; | |
185 | } | |
02be61a9 JPM |
186 | conn->peer_node = dnode; |
187 | conn->port = port; | |
188 | conn->peer_port = peer_port; | |
189 | ||
190 | tipc_node_lock(node); | |
191 | list_add_tail(&conn->list, &node->conn_sks); | |
192 | tipc_node_unlock(node); | |
8a0f6ebe YX |
193 | exit: |
194 | tipc_node_put(node); | |
195 | return err; | |
02be61a9 JPM |
196 | } |
197 | ||
f2f9800d | 198 | void tipc_node_remove_conn(struct net *net, u32 dnode, u32 port) |
02be61a9 JPM |
199 | { |
200 | struct tipc_node *node; | |
201 | struct tipc_sock_conn *conn, *safe; | |
202 | ||
34747539 | 203 | if (in_own_node(net, dnode)) |
02be61a9 JPM |
204 | return; |
205 | ||
f2f9800d | 206 | node = tipc_node_find(net, dnode); |
02be61a9 JPM |
207 | if (!node) |
208 | return; | |
209 | ||
210 | tipc_node_lock(node); | |
211 | list_for_each_entry_safe(conn, safe, &node->conn_sks, list) { | |
212 | if (port != conn->port) | |
213 | continue; | |
214 | list_del(&conn->list); | |
215 | kfree(conn); | |
216 | } | |
217 | tipc_node_unlock(node); | |
8a0f6ebe | 218 | tipc_node_put(node); |
02be61a9 JPM |
219 | } |
220 | ||
b97bf3fd | 221 | /** |
4323add6 | 222 | * tipc_node_link_up - handle addition of link |
c4307285 | 223 | * |
b97bf3fd PL |
224 | * Link becomes active (alone or shared) or standby, depending on its priority. |
225 | */ | |
a18c4bc3 | 226 | void tipc_node_link_up(struct tipc_node *n_ptr, struct tipc_link *l_ptr) |
b97bf3fd | 227 | { |
a18c4bc3 | 228 | struct tipc_link **active = &n_ptr->active_links[0]; |
b97bf3fd | 229 | |
5392d646 | 230 | n_ptr->working_links++; |
7b8613e0 YX |
231 | n_ptr->action_flags |= TIPC_NOTIFY_LINK_UP; |
232 | n_ptr->link_id = l_ptr->peer_bearer_id << 16 | l_ptr->bearer_id; | |
233 | ||
3fa9cacd EH |
234 | pr_debug("Established link <%s> on network plane %c\n", |
235 | l_ptr->name, l_ptr->net_plane); | |
c4307285 | 236 | |
b97bf3fd | 237 | if (!active[0]) { |
b97bf3fd PL |
238 | active[0] = active[1] = l_ptr; |
239 | node_established_contact(n_ptr); | |
16e166b8 | 240 | goto exit; |
b97bf3fd | 241 | } |
c4307285 | 242 | if (l_ptr->priority < active[0]->priority) { |
3fa9cacd | 243 | pr_debug("New link <%s> becomes standby\n", l_ptr->name); |
16e166b8 | 244 | goto exit; |
b97bf3fd | 245 | } |
247f0f3c | 246 | tipc_link_dup_queue_xmit(active[0], l_ptr); |
c4307285 | 247 | if (l_ptr->priority == active[0]->priority) { |
b97bf3fd | 248 | active[0] = l_ptr; |
16e166b8 | 249 | goto exit; |
b97bf3fd | 250 | } |
3fa9cacd | 251 | pr_debug("Old link <%s> becomes standby\n", active[0]->name); |
a10bd924 | 252 | if (active[1] != active[0]) |
3fa9cacd | 253 | pr_debug("Old link <%s> becomes standby\n", active[1]->name); |
b97bf3fd | 254 | active[0] = active[1] = l_ptr; |
16e166b8 JPM |
255 | exit: |
256 | /* Leave room for changeover header when returning 'mtu' to users: */ | |
ed193ece JPM |
257 | n_ptr->act_mtus[0] = active[0]->mtu - INT_H_SIZE; |
258 | n_ptr->act_mtus[1] = active[1]->mtu - INT_H_SIZE; | |
b97bf3fd PL |
259 | } |
260 | ||
261 | /** | |
262 | * node_select_active_links - select active link | |
263 | */ | |
6c00055a | 264 | static void node_select_active_links(struct tipc_node *n_ptr) |
b97bf3fd | 265 | { |
a18c4bc3 | 266 | struct tipc_link **active = &n_ptr->active_links[0]; |
b97bf3fd PL |
267 | u32 i; |
268 | u32 highest_prio = 0; | |
269 | ||
c4307285 | 270 | active[0] = active[1] = NULL; |
b97bf3fd PL |
271 | |
272 | for (i = 0; i < MAX_BEARERS; i++) { | |
a18c4bc3 | 273 | struct tipc_link *l_ptr = n_ptr->links[i]; |
b97bf3fd | 274 | |
4323add6 | 275 | if (!l_ptr || !tipc_link_is_up(l_ptr) || |
b97bf3fd PL |
276 | (l_ptr->priority < highest_prio)) |
277 | continue; | |
278 | ||
279 | if (l_ptr->priority > highest_prio) { | |
c4307285 | 280 | highest_prio = l_ptr->priority; |
b97bf3fd PL |
281 | active[0] = active[1] = l_ptr; |
282 | } else { | |
283 | active[1] = l_ptr; | |
284 | } | |
285 | } | |
286 | } | |
287 | ||
288 | /** | |
4323add6 | 289 | * tipc_node_link_down - handle loss of link |
b97bf3fd | 290 | */ |
a18c4bc3 | 291 | void tipc_node_link_down(struct tipc_node *n_ptr, struct tipc_link *l_ptr) |
b97bf3fd | 292 | { |
34747539 | 293 | struct tipc_net *tn = net_generic(n_ptr->net, tipc_net_id); |
a18c4bc3 | 294 | struct tipc_link **active; |
b97bf3fd | 295 | |
5392d646 | 296 | n_ptr->working_links--; |
7b8613e0 YX |
297 | n_ptr->action_flags |= TIPC_NOTIFY_LINK_DOWN; |
298 | n_ptr->link_id = l_ptr->peer_bearer_id << 16 | l_ptr->bearer_id; | |
5392d646 | 299 | |
4323add6 | 300 | if (!tipc_link_is_active(l_ptr)) { |
3fa9cacd EH |
301 | pr_debug("Lost standby link <%s> on network plane %c\n", |
302 | l_ptr->name, l_ptr->net_plane); | |
b97bf3fd PL |
303 | return; |
304 | } | |
3fa9cacd EH |
305 | pr_debug("Lost link <%s> on network plane %c\n", |
306 | l_ptr->name, l_ptr->net_plane); | |
b97bf3fd PL |
307 | |
308 | active = &n_ptr->active_links[0]; | |
309 | if (active[0] == l_ptr) | |
310 | active[0] = active[1]; | |
311 | if (active[1] == l_ptr) | |
312 | active[1] = active[0]; | |
313 | if (active[0] == l_ptr) | |
314 | node_select_active_links(n_ptr); | |
c4307285 | 315 | if (tipc_node_is_up(n_ptr)) |
170b3927 | 316 | tipc_link_failover_send_queue(l_ptr); |
c4307285 | 317 | else |
b97bf3fd | 318 | node_lost_contact(n_ptr); |
16e166b8 JPM |
319 | |
320 | /* Leave room for changeover header when returning 'mtu' to users: */ | |
321 | if (active[0]) { | |
ed193ece JPM |
322 | n_ptr->act_mtus[0] = active[0]->mtu - INT_H_SIZE; |
323 | n_ptr->act_mtus[1] = active[1]->mtu - INT_H_SIZE; | |
16e166b8 JPM |
324 | return; |
325 | } | |
16e166b8 | 326 | /* Loopback link went down? No fragmentation needed from now on. */ |
34747539 | 327 | if (n_ptr->addr == tn->own_addr) { |
16e166b8 JPM |
328 | n_ptr->act_mtus[0] = MAX_MSG_SIZE; |
329 | n_ptr->act_mtus[1] = MAX_MSG_SIZE; | |
330 | } | |
b97bf3fd PL |
331 | } |
332 | ||
8f19afb2 | 333 | int tipc_node_active_links(struct tipc_node *n_ptr) |
b97bf3fd | 334 | { |
76ae0d71 | 335 | return n_ptr->active_links[0] != NULL; |
b97bf3fd PL |
336 | } |
337 | ||
6c00055a | 338 | int tipc_node_is_up(struct tipc_node *n_ptr) |
b97bf3fd | 339 | { |
8f19afb2 | 340 | return tipc_node_active_links(n_ptr); |
b97bf3fd PL |
341 | } |
342 | ||
a18c4bc3 | 343 | void tipc_node_attach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr) |
b97bf3fd | 344 | { |
7a2f7d18 | 345 | n_ptr->links[l_ptr->bearer_id] = l_ptr; |
37b9c08a | 346 | n_ptr->link_cnt++; |
b97bf3fd PL |
347 | } |
348 | ||
a18c4bc3 | 349 | void tipc_node_detach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr) |
b97bf3fd | 350 | { |
7d33939f JPM |
351 | int i; |
352 | ||
353 | for (i = 0; i < MAX_BEARERS; i++) { | |
074bb43e JPM |
354 | if (l_ptr != n_ptr->links[i]) |
355 | continue; | |
356 | n_ptr->links[i] = NULL; | |
074bb43e | 357 | n_ptr->link_cnt--; |
7d33939f | 358 | } |
b97bf3fd PL |
359 | } |
360 | ||
6c00055a | 361 | static void node_established_contact(struct tipc_node *n_ptr) |
b97bf3fd | 362 | { |
aecb9bb8 | 363 | n_ptr->action_flags |= TIPC_NOTIFY_NODE_UP; |
c64f7a6a | 364 | n_ptr->bclink.oos_state = 0; |
1da46568 YX |
365 | n_ptr->bclink.acked = tipc_bclink_get_last_sent(n_ptr->net); |
366 | tipc_bclink_add_node(n_ptr->net, n_ptr->addr); | |
b97bf3fd PL |
367 | } |
368 | ||
6c00055a | 369 | static void node_lost_contact(struct tipc_node *n_ptr) |
b97bf3fd | 370 | { |
b97bf3fd | 371 | char addr_string[16]; |
708ac32c JPM |
372 | struct tipc_sock_conn *conn, *safe; |
373 | struct list_head *conns = &n_ptr->conn_sks; | |
374 | struct sk_buff *skb; | |
375 | struct tipc_net *tn = net_generic(n_ptr->net, tipc_net_id); | |
376 | uint i; | |
b97bf3fd | 377 | |
3fa9cacd EH |
378 | pr_debug("Lost contact with %s\n", |
379 | tipc_addr_string_fill(addr_string, n_ptr->addr)); | |
c5bd4d85 AS |
380 | |
381 | /* Flush broadcast link info associated with lost node */ | |
389dd9bc | 382 | if (n_ptr->bclink.recv_permitted) { |
05dcc5aa | 383 | __skb_queue_purge(&n_ptr->bclink.deferdq); |
c5bd4d85 | 384 | |
37e22164 JPM |
385 | if (n_ptr->bclink.reasm_buf) { |
386 | kfree_skb(n_ptr->bclink.reasm_buf); | |
387 | n_ptr->bclink.reasm_buf = NULL; | |
c5bd4d85 AS |
388 | } |
389 | ||
1da46568 | 390 | tipc_bclink_remove_node(n_ptr->net, n_ptr->addr); |
36559591 | 391 | tipc_bclink_acknowledge(n_ptr, INVALID_LINK_SEQ); |
b97bf3fd | 392 | |
389dd9bc | 393 | n_ptr->bclink.recv_permitted = false; |
c5bd4d85 | 394 | } |
b97bf3fd | 395 | |
dff29b1a | 396 | /* Abort any ongoing link failover */ |
b97bf3fd | 397 | for (i = 0; i < MAX_BEARERS; i++) { |
a18c4bc3 | 398 | struct tipc_link *l_ptr = n_ptr->links[i]; |
c4307285 | 399 | if (!l_ptr) |
b97bf3fd | 400 | continue; |
dff29b1a JPM |
401 | l_ptr->flags &= ~LINK_FAILINGOVER; |
402 | l_ptr->failover_checkpt = 0; | |
403 | l_ptr->failover_pkts = 0; | |
404 | kfree_skb(l_ptr->failover_skb); | |
405 | l_ptr->failover_skb = NULL; | |
4323add6 | 406 | tipc_link_reset_fragments(l_ptr); |
b97bf3fd PL |
407 | } |
408 | ||
ca9cf06a YX |
409 | n_ptr->action_flags &= ~TIPC_WAIT_OWN_LINKS_DOWN; |
410 | ||
708ac32c JPM |
411 | /* Prevent re-contact with node until cleanup is done */ |
412 | n_ptr->action_flags |= TIPC_WAIT_PEER_LINKS_DOWN; | |
413 | ||
414 | /* Notify publications from this node */ | |
415 | n_ptr->action_flags |= TIPC_NOTIFY_NODE_DOWN; | |
416 | ||
417 | /* Notify sockets connected to node */ | |
418 | list_for_each_entry_safe(conn, safe, conns, list) { | |
419 | skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG, | |
420 | SHORT_H_SIZE, 0, tn->own_addr, | |
421 | conn->peer_node, conn->port, | |
422 | conn->peer_port, TIPC_ERR_NO_NODE); | |
423 | if (likely(skb)) { | |
424 | skb_queue_tail(n_ptr->inputq, skb); | |
425 | n_ptr->action_flags |= TIPC_MSG_EVT; | |
426 | } | |
427 | list_del(&conn->list); | |
428 | kfree(conn); | |
429 | } | |
b97bf3fd PL |
430 | } |
431 | ||
78acb1f9 EH |
432 | /** |
433 | * tipc_node_get_linkname - get the name of a link | |
434 | * | |
435 | * @bearer_id: id of the bearer | |
436 | * @node: peer node address | |
437 | * @linkname: link name output buffer | |
438 | * | |
439 | * Returns 0 on success | |
440 | */ | |
f2f9800d YX |
441 | int tipc_node_get_linkname(struct net *net, u32 bearer_id, u32 addr, |
442 | char *linkname, size_t len) | |
78acb1f9 EH |
443 | { |
444 | struct tipc_link *link; | |
8a0f6ebe | 445 | int err = -EINVAL; |
f2f9800d | 446 | struct tipc_node *node = tipc_node_find(net, addr); |
78acb1f9 | 447 | |
8a0f6ebe YX |
448 | if (!node) |
449 | return err; | |
450 | ||
451 | if (bearer_id >= MAX_BEARERS) | |
452 | goto exit; | |
453 | ||
78acb1f9 EH |
454 | tipc_node_lock(node); |
455 | link = node->links[bearer_id]; | |
456 | if (link) { | |
457 | strncpy(linkname, link->name, len); | |
8a0f6ebe | 458 | err = 0; |
78acb1f9 | 459 | } |
8a0f6ebe | 460 | exit: |
78acb1f9 | 461 | tipc_node_unlock(node); |
8a0f6ebe YX |
462 | tipc_node_put(node); |
463 | return err; | |
78acb1f9 | 464 | } |
9db9fdd1 YX |
465 | |
466 | void tipc_node_unlock(struct tipc_node *node) | |
467 | { | |
f2f9800d | 468 | struct net *net = node->net; |
ca0c4273 | 469 | u32 addr = 0; |
c637c103 | 470 | u32 flags = node->action_flags; |
7b8613e0 | 471 | u32 link_id = 0; |
708ac32c | 472 | struct list_head *publ_list; |
c637c103 | 473 | struct sk_buff_head *inputq = node->inputq; |
708ac32c | 474 | struct sk_buff_head *namedq; |
9db9fdd1 | 475 | |
c637c103 JPM |
476 | if (likely(!flags || (flags == TIPC_MSG_EVT))) { |
477 | node->action_flags = 0; | |
9db9fdd1 | 478 | spin_unlock_bh(&node->lock); |
c637c103 JPM |
479 | if (flags == TIPC_MSG_EVT) |
480 | tipc_sk_rcv(net, inputq); | |
9db9fdd1 YX |
481 | return; |
482 | } | |
483 | ||
7b8613e0 YX |
484 | addr = node->addr; |
485 | link_id = node->link_id; | |
c637c103 | 486 | namedq = node->namedq; |
708ac32c | 487 | publ_list = &node->publ_list; |
7b8613e0 | 488 | |
cb1b7280 JPM |
489 | node->action_flags &= ~(TIPC_MSG_EVT | |
490 | TIPC_NOTIFY_NODE_DOWN | TIPC_NOTIFY_NODE_UP | | |
491 | TIPC_NOTIFY_LINK_DOWN | TIPC_NOTIFY_LINK_UP | | |
492 | TIPC_WAKEUP_BCAST_USERS | TIPC_BCAST_MSG_EVT | | |
b952b2be | 493 | TIPC_NAMED_MSG_EVT | TIPC_BCAST_RESET); |
7b8613e0 | 494 | |
9db9fdd1 YX |
495 | spin_unlock_bh(&node->lock); |
496 | ||
708ac32c JPM |
497 | if (flags & TIPC_NOTIFY_NODE_DOWN) |
498 | tipc_publ_notify(net, publ_list, addr); | |
50100a5e | 499 | |
908344cd | 500 | if (flags & TIPC_WAKEUP_BCAST_USERS) |
f2f9800d | 501 | tipc_bclink_wakeup_users(net); |
908344cd | 502 | |
7b8613e0 | 503 | if (flags & TIPC_NOTIFY_NODE_UP) |
f2f9800d | 504 | tipc_named_node_up(net, addr); |
7b8613e0 YX |
505 | |
506 | if (flags & TIPC_NOTIFY_LINK_UP) | |
f2f9800d | 507 | tipc_nametbl_publish(net, TIPC_LINK_STATE, addr, addr, |
7b8613e0 YX |
508 | TIPC_NODE_SCOPE, link_id, addr); |
509 | ||
510 | if (flags & TIPC_NOTIFY_LINK_DOWN) | |
f2f9800d | 511 | tipc_nametbl_withdraw(net, TIPC_LINK_STATE, addr, |
7b8613e0 | 512 | link_id, addr); |
c637c103 JPM |
513 | |
514 | if (flags & TIPC_MSG_EVT) | |
515 | tipc_sk_rcv(net, inputq); | |
516 | ||
517 | if (flags & TIPC_NAMED_MSG_EVT) | |
518 | tipc_named_rcv(net, namedq); | |
cb1b7280 JPM |
519 | |
520 | if (flags & TIPC_BCAST_MSG_EVT) | |
521 | tipc_bclink_input(net); | |
b952b2be YX |
522 | |
523 | if (flags & TIPC_BCAST_RESET) | |
524 | tipc_link_reset_all(node); | |
9db9fdd1 | 525 | } |
3e4b6ab5 RA |
526 | |
527 | /* Caller should hold node lock for the passed node */ | |
d8182804 | 528 | static int __tipc_nl_add_node(struct tipc_nl_msg *msg, struct tipc_node *node) |
3e4b6ab5 RA |
529 | { |
530 | void *hdr; | |
531 | struct nlattr *attrs; | |
532 | ||
bfb3e5dd | 533 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
3e4b6ab5 RA |
534 | NLM_F_MULTI, TIPC_NL_NODE_GET); |
535 | if (!hdr) | |
536 | return -EMSGSIZE; | |
537 | ||
538 | attrs = nla_nest_start(msg->skb, TIPC_NLA_NODE); | |
539 | if (!attrs) | |
540 | goto msg_full; | |
541 | ||
542 | if (nla_put_u32(msg->skb, TIPC_NLA_NODE_ADDR, node->addr)) | |
543 | goto attr_msg_full; | |
544 | if (tipc_node_is_up(node)) | |
545 | if (nla_put_flag(msg->skb, TIPC_NLA_NODE_UP)) | |
546 | goto attr_msg_full; | |
547 | ||
548 | nla_nest_end(msg->skb, attrs); | |
549 | genlmsg_end(msg->skb, hdr); | |
550 | ||
551 | return 0; | |
552 | ||
553 | attr_msg_full: | |
554 | nla_nest_cancel(msg->skb, attrs); | |
555 | msg_full: | |
556 | genlmsg_cancel(msg->skb, hdr); | |
557 | ||
558 | return -EMSGSIZE; | |
559 | } | |
560 | ||
561 | int tipc_nl_node_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
562 | { | |
563 | int err; | |
f2f9800d YX |
564 | struct net *net = sock_net(skb->sk); |
565 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
3e4b6ab5 RA |
566 | int done = cb->args[0]; |
567 | int last_addr = cb->args[1]; | |
568 | struct tipc_node *node; | |
569 | struct tipc_nl_msg msg; | |
570 | ||
571 | if (done) | |
572 | return 0; | |
573 | ||
574 | msg.skb = skb; | |
575 | msg.portid = NETLINK_CB(cb->skb).portid; | |
576 | msg.seq = cb->nlh->nlmsg_seq; | |
577 | ||
578 | rcu_read_lock(); | |
8a0f6ebe YX |
579 | if (last_addr) { |
580 | node = tipc_node_find(net, last_addr); | |
581 | if (!node) { | |
582 | rcu_read_unlock(); | |
583 | /* We never set seq or call nl_dump_check_consistent() | |
584 | * this means that setting prev_seq here will cause the | |
585 | * consistence check to fail in the netlink callback | |
586 | * handler. Resulting in the NLMSG_DONE message having | |
587 | * the NLM_F_DUMP_INTR flag set if the node state | |
588 | * changed while we released the lock. | |
589 | */ | |
590 | cb->prev_seq = 1; | |
591 | return -EPIPE; | |
592 | } | |
593 | tipc_node_put(node); | |
3e4b6ab5 RA |
594 | } |
595 | ||
f2f9800d | 596 | list_for_each_entry_rcu(node, &tn->node_list, list) { |
3e4b6ab5 RA |
597 | if (last_addr) { |
598 | if (node->addr == last_addr) | |
599 | last_addr = 0; | |
600 | else | |
601 | continue; | |
602 | } | |
603 | ||
604 | tipc_node_lock(node); | |
605 | err = __tipc_nl_add_node(&msg, node); | |
606 | if (err) { | |
607 | last_addr = node->addr; | |
608 | tipc_node_unlock(node); | |
609 | goto out; | |
610 | } | |
611 | ||
612 | tipc_node_unlock(node); | |
613 | } | |
614 | done = 1; | |
615 | out: | |
616 | cb->args[0] = done; | |
617 | cb->args[1] = last_addr; | |
618 | rcu_read_unlock(); | |
619 | ||
620 | return skb->len; | |
621 | } |